Harrow attachment hook component



y 2, 1967 R. BOBROWSKI 3,316,982

HARROW ATTACHMENT HOOK COMPONENT Filed Dec. 21, 1964 INVENTOR. RHE l NHA RD BOBROWSKI United States Patent Ofitice 3,316,982 HARROW ATTACHMENTHOOK COMPONENT Rheinhard Bobrowski, Morris, Manitoba, Canada, assignorto Manitoba Development Fund, Winnipeg, Manitoba, Canada Filed Dec. 21,1964, Ser. No. 419,639 1 Claim. (Cl. 172-677) My invention relates tonew and useful improvements in harrow hook components which permit theharrow sections to be connected to a harrow draw bar or the like bymeans of chains.

Conventional hook components on harrow sections are normally open hookshaving projecting corners or the like which permit the chains to becomeunhooked from the harrow sections particularly during turns.

Furthermore the corners on such hooks often are en gaged by anadditional link of the chain while turning thus upsetting the draftcharacteristics of the harrow sections.

I have overcome these disadvantages by providing a hook componentpreferably for-med from a stamping and having a central aperture formedtherein, the hook curving smoothly over and into the aperture with thedistal end of the hook terminating substantially flush with theunderside of the component so that a chain link has to be insertedwithin the aperture before it can be engaged on the hook.

This prevents undesirable disengagement of the chain and also preventsundesirable fouling of other links upon the hook component particularlywhen turns are made with the harrows.

The principal object and essence of the invention is there ore toprovide a device of the character herewithin described which preventsundesirable disengagement of the chains from the harrow hooks.

Another object of the invention is to provide a device of the characterherewithin described which is simply formed from a stamping thus makingit extremely economical in manufacture.

A yet further object of the invention is to provide a device of thecharacter herewithin described which provides means to support the strapnormally transferring the load from the rear harrow member to the nextadjacent member.

Still another object of the invention is to provide a device of thecharacter herewithin described which is simple in construction,economical in manufacture, and otherwise Well suited to the purpose forwhich it is designed.

With the foregoing objects in view, and such other objects andadvantages as will become apparent to those skilled in the art to whichthis invention relates as this specification proceeds, my inventionconsists essentially in the arrangement and construction of parts all ashereinafter more particularly described, reference being had to theaccompanying drawings in which:

FIGURE 1 is perspective fragmentary view of a portion of a harrowshowing my invention thereon.

FIGURE 2 is a top plan view of the attachment hook component.

FIGURE 3 is a side sectional elevation of FIG. 2 and showing the methodof attaching the chain link to the hook.

In the drawings like characters of reference indicate correspondingparts in the different figures.

Proceed-ing therefore to describe the invention in detail, referencecharacter illustrates the [front transverse frame member of a harrow and11 the next adjacent frame member, said frame members being maintainedin spaced apart relationship by means of the cross members 12.

3,316,982 Patented May 2, 1967 It will be appreciated that this is onlyone section of a harrow, but as the other sections are similar, it hasnot been deemed necessary to illustrate same.

It should also be appreciated that although the portion of the harrowillustrated is what is known as a diamond harrow, nevertheless theattachment component can be utilized with any type of harrow.

My devicecolleotively designated 13 comprises a sub stantiallyrectangular stamping 14 being provided with a centrally located aperture15. The walls 16 bounding the aperture form a substantially rectangularaperture clear through the stamping and a book 17 is also formedintegrally With the stamping and extends from the side edge 18 thereof.This book curves upwardly over and towards the center of the rectangularstamping 14 as shown in FIG. 3 and the distal end 19 of the hookterminates substantially centrally within the aperture 15 andsubstantially in the plane of the undersurfa-ce 20 of the stamping asclearly shown in FIG. 3.

A pair of lugs 21 are also tformed integrally with the stamping upon theopposite side edge 22 to the edge 18, said lugs inclining upwardly andoutwardly.

A strap 23 is bolted to the next adjacent frame member 11 of the harrowand extends diagonally towards the frame ing same from pivoting withrelation to the frame member 10.

In operation, the chain link 25 is inserted within the aperture 15 sothat it is engaged over the distal end 19 of the hook 17. It is thenrotated through the arc indicated by arrow 26 to take up the positionshown in phantom in FIGURE 3.

This means that it is almost impossible for the hook to be disengagedinadvertently during the turning operation.

The smooth contour of the outer surface 27 of the book also preventsundesirable entanglement of the other chain links, an occurrenceprevalent with conventional hooks due the turning operation.

Since various such spirit and scope, it is intended that all mattercontained in the accompanying specification shall be interpreted asillustrative only and not in a limiting sense.

What I claim as my invention is:

trap, a single fastening element extending through said he end port-ionof the strap and through said rear piece f the plate and through saidfirst frame member wherey to provide sole means for securing the sametogether, .nother fastening element securing said strap to the sec- |ndframe member of the harrow frame in spaced relaion from the firstmentioned fastening element, and a ai r of transversely spaced upturnedlugs provided inegrally at the rear edge of the rear piece of said platen alignment with said side pieces thereof, the translerse spacing ofsaid lugs being such that they abuttingy engage the opposite sides ofsaid one end portion of References Cited by the Examiner UNITED STATESPATENTS 9/1882 Johnson 172-677 X 8/1890 Bowman 172-677 X 10 ABRAHAM G.STONE, Primary Examiner.

A. E. KOPECKI, Assistant Examiner.

